Answer
Width = $4.06$ m.
Length= $4.45$ m.
Work Step by Step
Let the width be x meters.
Then the length is $(x+0.39)$ meters.
Double the sum of the sides equals the perimeter:
$2[x+(x+0.39)]=17.02$
$2(2x+0.39)=17.02$
$4x+0.78==17.02$
$4x=16.24$
$x=4.06$
Width = $4.06$ m.
Length=$4.06+0.39=4.45$ m